You are implementing a chatbot to help an online retailer streamline their customer service. The chatbot must be able to respond to both text and voice inquiries.
You are looking for a low-code or no-cade option, and you want to be able to easily train the chatbot to provide answers to keywords. What should you do?

A. Use the Cloud Speech-to-Text API to build a Python application in App Engine. B. Use the Cloud Speech-to-Text API to build a Python application in a Compute Engine instance. C. Use Dialogflow for simple queries and the Cloud Speech-to-Text API for complex queries. D. Use Dialogflow to implement the chatbot, defining the intents based on the most common queries collected.